Remove empty include directories on make user_uninstall.

git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@4163 7894878c-1315-0410-8ee3-d5d059ff63e0

lib/Module.mk

@@ -160,6 +160,8 @@ user_install :: install-lib
 user_uninstall::
 	$(RM) $(REMOVELIBST) $(REMOVELIBSH) $(REMOVELNSO) $(REMOVELNBS) 
 	$(RM) $(REMOVELIBHF) $(REMOVEMAN3) $(REMOVEMAN5)
+# Remove directory if empty, ignore failure
+	$(RMDIR) $(DESTDIR)$(LIBINCLUDEDIR) 2> /dev/null || true
 
 clean-lib:
 	$(RM) $(LIB_DIR)/*.ld $(LIB_DIR)/*.ad